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vlabodo [156]
3 years ago
8

Advantages and disadvantages of solar power

Chemistry
1 answer:
Andrews [41]3 years ago
5 0

Answer:

Advantakes= it is a renewable source, you can but it anywhere with sunlight

disatvantage= it cost a lot to place/replace, it uses a lot of different materials

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30,000 J of heat are added to 23.0 kg of steel to reach a final temperature of 140
kolbaska11 [484]

The initial temperature is 137.34 °C.

<u>Explanation:</u>

As the specific heat formula says that the heat energy required is directly proportional to the mass and change in temperature of the system.

Q = mcΔT

So, here the mass m is given as 23 kg, the specific heat of steel is given as c = 490 J/kg°C and the initial temperature is required to find with the final temperature being 140 °C. Also the heat energy required is 30,000 J.

ΔT =\frac{Q}{mc}

ΔT =\frac{30000}{23 \times 490} = \frac{30000}{11270} =2.66

Since the difference in temperature is 2.66, then the initial temperature will be

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Initial temperature = 140-2.66 = 137.34 °C

Thus, the initial temperature is 137.34 °C.

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